Battery pack and energy storage equipment

Abstract

The utility model discloses a battery pack and energy storage equipment, and belongs to the technical field of batteries, the battery pack comprises a plurality of battery monomers, each battery monomer comprises a body and a pole arranged on the body, the pole comprises a first pole and a second pole which are opposite in polarity, the first pole is electrically connected with the body, and the plurality of battery monomers are sequentially connected in series; and the voltage sampling piece is electrically connected with each body. Structures such as wiring harnesses required by voltage acquisition of the battery pack are simplified, and space occupation is reduced.

Description

Battery packs and energy storage devices Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a battery pack and energy storage device. Background Technology

[0002] Currently, in order to obtain the status information of each battery in a battery pack in a timely manner, external sampling harnesses are usually used to collect information such as voltage of each battery. Among them, voltage sampling harnesses need to be arranged on both the positive and negative sides of the battery. The routing of multiple harnesses not only occupies the space for battery arrangement, but also makes the internal structure of the battery pack more complex. Summary of the Invention

[0003] Purpose of this application: This application provides a battery pack to overcome the above-mentioned technical problems; another purpose of this application is to provide an energy storage device that uses the above-mentioned battery pack.

[0004] Technical solution: A battery pack according to an embodiment of this application includes:

[0005] Multiple battery cells, each battery cell including a body and terminals disposed on the body, each terminal including a first terminal and a second terminal with opposite polarity, the first terminal being electrically connected to the body, and the multiple battery cells being connected in series.

[0006] Voltage sampling element, electrically connected to each of the bodies.

[0007] In some embodiments, the voltage sampling device includes multiple sampling wires, each of which is electrically connected to one of the main bodies.

[0008] In some embodiments, the battery cell further includes an explosion-proof valve, wherein the pressure relief direction of the explosion-proof valve is opposite to that of the voltage sampling element.

[0009] In some embodiments, the body includes a housing and a cover connected to each other, the first pole, the second pole and the explosion-proof valve are respectively disposed on the cover, and the sampling harness is electrically connected to the cover.

[0010] In some embodiments, the explosion-proof valve is disposed between the pole and the sampling harness, the cover has a dimension a in its own length direction, and the distance between the explosion-proof valve and the nearest adjacent pole in the length direction is b, satisfying a / 5≤b≤a / 2.

[0011] In some embodiments, the explosion-proof valve and the pole are misaligned in the width direction of the cover (101).

[0012] In some embodiments, the cover has a dimension of c in its width direction, and the distance between the nearest adjacent side of the explosion-proof valve and the cover in the width direction is d, satisfying c / 5≤d≤c / 2.

[0013] In some embodiments, the battery pack further includes an electrical connection portion through which the first terminal is electrically connected to the body, and the electrical connection portion is configured to melt when the current exceeds a threshold.

[0014] In some embodiments, the first terminal is configured as a positive terminal, and the second terminal is configured as a negative terminal.

[0015] Accordingly, an energy storage device provided in this application embodiment includes the aforementioned battery pack.

[0016] Beneficial Effects: The battery pack of this application embodiment includes multiple battery cells and a voltage sampling device. Each battery cell includes a body and terminals disposed on the body. The terminals include a first terminal and a second terminal with opposite polarities. The first terminal is electrically connected to the body, and multiple battery cells are connected in series. The voltage sampling device is electrically connected to each body. The first terminal of each battery cell is at the same potential as the body. The voltage sampling device is electrically connected to the multiple bodies connected in series, allowing it to collect the voltage difference between the bodies of each battery cell. In two adjacent battery cells, the first terminal of one is connected in series with the second terminal of the other, thus collecting the voltage difference between the body and the second terminal of the same battery cell. This allows for the calculation of the voltage of each battery cell, simplifying the wiring harness and other structures required for battery pack voltage acquisition and reducing space occupation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 is a schematic diagram of the battery pack provided in an embodiment of this application;

[0019] Figure 2 is a schematic diagram of the structure of the first pole electrical connection housing provided in an embodiment of this application;

[0020] Figure 3 is a schematic diagram of the structure of the second pole electrical connection housing provided in another embodiment of this application;

[0021] Figure 4 is a schematic diagram of the explosion-proof valve provided in another embodiment of this application, which is disposed in the housing.

[0022] Reference numerals: 1. Battery cell; 10. Body; 100. Shell; 101. Cover; 11. Terminal; 110. First terminal; 111. Second terminal; 12. Explosion-proof valve; 2. Voltage sampling component; 20. Sampling harness; 3. Electrical connection; 4. Busbar; X, length direction; Y, width direction. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0025] Currently, in fields such as energy storage devices and power batteries, external sampling harnesses are typically used to collect voltage and other information from each battery in a battery pack in order to obtain the status information of each battery in a timely manner. This requires voltage sampling harnesses to be installed on both the positive and negative sides of the battery. The routing of multiple harnesses not only occupies space within the battery pack but also makes the internal structure of the battery pack more complex.

[0026] In addition, batteries usually need to be equipped with explosion-proof valves. When the battery experiences thermal runaway, the high-temperature fumes emitted by the explosion-proof valves can easily melt the outer insulation layer of each sampling harness, which can easily cause the harness to spark, thereby igniting the runaway fumes and causing more serious safety accidents.

[0027] In view of the above, referring to Figures 1 to 4, embodiments of this application provide a battery pack to overcome at least one of the above-mentioned technical problems.

[0028] Referring to Figures 1 and 2, a battery pack includes multiple battery cells 1 and a voltage sampling device 2.

[0029] Each battery cell 1 includes a body 10 and terminals 11 disposed on the body 10. The terminals 11 include a first terminal 110 and a second terminal 111 with opposite polarities. The first terminal 110 is electrically connected to the body 10. Multiple battery cells 1 are connected in series. A voltage sampling device 2 is electrically connected to each body 10.

[0030] The first terminal 110 and the corresponding body 10 are electrically connected to achieve equipotentiality. The voltage sampling device 2 is electrically connected to multiple bodies 10. The voltage sampling device can collect the voltage difference between the bodies 10 of each battery cell 1. The first terminal 110 of one of two adjacent battery cells 1 is connected in series with the second terminal 111 of the other. Therefore, the voltage difference between the body 10 and the second terminal 111 of the same battery cell 1 is collected. Thus, the voltage of each battery cell 1 can be collected and calculated. This helps to simplify the wiring harness and other structures required for battery pack voltage acquisition and reduce the space occupied.

[0031] In some embodiments, referring to Figures 1 and 2, the first terminal 110 is configured as a positive terminal, and the second terminal 111 is configured as a negative terminal. By electrically connecting the body 10 to the positive terminal, it is beneficial to increase the potential of the body 10 and reduce the risk of lithium intercalation corrosion of the body 10.

[0032] For example, referring to Figure 2, this embodiment takes five battery cells 1 connected in series as an example. The voltage sampling device 2 includes multiple sampling wire bundles 20, each of which is electrically connected to a battery body 10. Each sampling wire bundle 20 forms electrical connection points o1, o2, o3, o4, and o5 corresponding to the position where it is electrically connected to each battery body 10. In the battery cell 1 located at the bottom in Figure 2, the voltage of the battery cell 1 can be obtained by sampling the voltage difference between o1 and the adjacent second terminal 111. The voltage of the second battery body 10 from bottom to top can be obtained by sampling the voltage difference between o1 and o2. Similarly, the voltage of the third battery body 10 from bottom to top can be obtained by sampling the voltage difference between o2 and o3, the voltage of the fourth battery body 10 from bottom to top can be obtained by sampling the voltage difference between o3 and o4, and the voltage of the fifth battery body 10 from bottom to top can be obtained by sampling the voltage difference between o4 and o5. This simplifies the use of the sampling wire bundles 20 and reduces space occupation.

[0033] In some embodiments, referring to Figures 1 and 3, the first terminal 110 can also be configured as a negative terminal, and the second terminal 111 as a positive terminal. By electrically connecting the body 10 to the negative terminal, the negative terminal and the body 10 are at the same potential, which helps to reduce the risk of external short circuits caused by external shorting of the positive terminal and the body 10, and improves the safety of the battery cell 1. Correspondingly, the acquisition principle of the voltage sampling element 2 is the same as that of the first terminal 110 being configured as a positive terminal, and will not be described again here.

[0034] To further enhance the protection of the voltage sampling element 2, in some embodiments, referring to Figures 2 and 3, the battery cell 1 also includes an explosion-proof valve 12, which is configured to break open and release pressure in a direction away from the voltage sampling element 2 when the pressure inside the body 10 exceeds a threshold.

[0035] Specifically, in some embodiments, referring to Figures 1, 2 and 4, the body 10 includes a housing 100 and a cover 101 connected to each other. A first pole post 110, a second pole post 111 and an explosion-proof valve 12 are respectively disposed on the cover 101, and a sampling harness 20 is electrically connected to the cover 101.

[0036] In some embodiments, referring to FIG1, multiple battery cells 1 are arranged sequentially along the width direction Y, and a voltage sampling element 2 is disposed on the side of the cover 101 opposite to the housing 100, extending along the width direction Y. The battery pack also includes a busbar 4, through which the first terminal 110 and the second terminal 111 of adjacent battery cells 1 are electrically connected in the width direction Y, thereby realizing the series connection of multiple battery cells 1. Arranging the battery cells 1 sequentially along the width direction Y and centrally setting the busbar 4 and voltage sampling element 2 facilitates subsequent maintenance.

[0037] In some embodiments, referring to Figure 1, the explosion-proof valve 12 is disposed between the terminal post 11 and the sampling harness 20. The cover 101 has a dimension 'a' in its own length direction X, and the distance between the explosion-proof valve 12 and the nearest adjacent terminal post 11 in the length direction X is 'b', satisfying a / 5 ≤ b ≤ a / 2. Taking the battery cell 1 shown in Figure 2 as an example, the terminal post 11 closest to the explosion-proof valve 12 in the first battery cell 1 from top to bottom is the first terminal post 110, and the terminal post 11 adjacent to the explosion-proof valve 12 in the second battery cell 1 is the second terminal post 111. Since the pressure relief direction of the explosion-proof valve 12 is away from the voltage sampling element 2, as shown in Figures 2 and 3, a certain space is reserved between the terminal post 11 and the explosion-proof valve 12 to reduce the impact of the pressure relief of the explosion-proof valve 12 on the terminal post 11 side.

[0038] In some embodiments, referring to FIG1, the explosion-proof valve 12 and the pole post 11 are misaligned in the width direction Y, which helps to further reduce the impact of the explosion-proof valve 12 depressurization on the pole post 11 side, such as damaging the outer insulation structure of the pole post 11.

[0039] Furthermore, in some embodiments, referring to Figure 1, the cover 101 has a dimension of c in its width direction Y, and the distance d between the nearest adjacent sides of the explosion-proof valve 12 and the cover 101 in the width direction Y satisfies c / 5≤d≤c / 2. On the one hand, setting c / 5≤d helps avoid the explosion-proof valve 12 being positioned too close to the side of the cover 101, reducing the risk of stress concentration at the opening position of the explosion-proof valve 12 causing deformation of the cover 101. On the other hand, setting d≤c / 2 helps reduce the risk of the explosion-proof valve 12's pressure relief affecting the pole 11 side.

[0040] In some embodiments, referring to FIG1, the battery pack further includes an electrical connection portion 3. The first terminal 110 is electrically connected to the body 10 through the electrical connection portion 3. In this embodiment, the electrical connection portion 3 is disposed on the cover 101 corresponding to the terminal 11 and is electrically connected to the cover 101. The electrical connection portion 3 is configured to melt when the current exceeds a threshold. When the second terminal 111 and the cover 101 are short-circuited, a discharge circulating current is generated outside the battery cell 1, which will cause the electrical connection portion 3 to melt. At this time, the voltage collected is significantly lower than the voltage of the normal battery cell 1, which is beneficial for quickly locating the faulty battery cell 1.

[0041] Furthermore, in some embodiments, referring to Figure 4, the explosion-proof valve 12 can also be disposed on the housing 100. In this embodiment, the explosion-proof valve 12 is located on the side of the housing 100 away from the cover 101. The explosion-proof valve 12, the electrode post 11, and the voltage sampling element 2, etc., are distributed on opposite sides, realizing the thermoelectric separation of the battery cell 1. This helps to reduce the damage to the electrical connection structure caused by the pressure relief of the explosion-proof valve 12 when the battery cell 1 experiences thermal runaway, and improves the protection of the electrical connection structure.

[0042] Accordingly, this application provides an energy storage device for storing and releasing electrical energy. The energy storage device can be a charging and discharging structure composed of multiple battery packs, such as a battery module, battery pack, battery cluster, battery stack, battery tower, or battery array. It is understood that this energy storage device possesses all the technical features and effects of the aforementioned battery packs, which will not be elaborated upon here.

[0043] The battery pack and energy storage device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells (1), each battery cell (1) includes a body (10) and terminals (11) disposed on the body (10). Each terminal (11) includes a first terminal (110) and a second terminal (111) with opposite polarities. The first terminal (110) is electrically connected to the body (10). The multiple battery cells (1) are connected in series. A voltage sampling device (2) is electrically connected to each of the bodies (10).

2. The battery pack according to claim 1, characterized in that, The voltage sampling device (2) includes multiple sampling wire bundles (20), each of which is electrically connected to one of the main bodies (10).

3. The battery pack according to claim 2, characterized in that, The battery cell (1) also includes an explosion-proof valve (12), the pressure relief direction of which is opposite to that of the voltage sampling element (2).

4. The battery pack according to claim 3, characterized in that, The main body (10) includes a housing (100) and a cover (101) connected to each other. The first pole (110), the second pole (111) and the explosion-proof valve (12) are respectively disposed on the cover (101), and the sampling harness (20) is electrically connected to the cover (101).

5. The battery pack according to claim 4, characterized in that, The explosion-proof valve (12) is located between the pole post (11) and the sampling harness (20). The cover (101) has a dimension a in its own length direction (X). In the length direction (X), the distance between the explosion-proof valve (12) and the nearest adjacent pole post (11) is b, satisfying a / 5≤b≤a / 2.

6. The battery pack according to claim 5, characterized in that, In the width direction (Y) of the cover (101), the explosion-proof valve (12) and the pole (11) are misaligned.

7. The battery pack according to claim 6, characterized in that, The cover (101) has a dimension of c in its width direction (Y). In the width direction (Y), the distance between the sides of the nearest adjacent distance between the explosion-proof valve (12) and the cover (101) is d, which satisfies c / 5≤d≤c / 2.

8. The battery pack according to any one of claims 1 to 7, characterized in that, The battery pack also includes an electrical connection (3), through which the first terminal (110) is electrically connected to the body (10), and the electrical connection (3) is configured to melt when the current exceeds a threshold.

9. The battery pack according to any one of claims 1 to 7, characterized in that, The first terminal (110) is set as a positive terminal, and the second terminal (111) is set as a negative terminal.

10. An energy storage device, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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