Battery pack and battery pack comprising same

Abstract

The utility model provides a battery pack and a battery pack containing the battery pack, the battery pack comprises a battery support and a plurality of batteries accommodated in the battery support, the plurality of batteries are connected in parallel, and the battery pack is characterized by further comprising two guide plates which respectively cover the upper surface and the lower surface of the battery support, the positive end face and the negative end face of the battery are exposed out of the retaining holes in the upper surface and the lower surface of the battery support respectively and make close contact with the two guide plates respectively, the guide plate making contact with the positive end face of the battery is a positive guide plate, and the guide plate making contact with the negative end face of the battery is a negative guide plate. And the positive electrode guide plate and the negative electrode guide plate have heat conduction and electric conduction functions.

Description

Technical Field

[0001] This utility model relates to a battery pack, specifically, to a battery pack capable of achieving uniform heat distribution in a battery system, and a battery pack containing the battery pack. Background Technology

[0002] High-power battery packs used in rail transit, infrastructure, and other applications typically consist of multiple battery modules, each containing multiple individual cells connected in parallel. In traditional battery packs, to prevent uneven battery temperature and / or thermal runaway, measures such as increasing the gap between cells and installing heat dissipation holes on the battery pack casing are generally adopted. External heat dissipation mechanisms are used to fully cool each cell, reduce the temperature difference between each cell and the environment, and thus achieve uniform heat distribution among the battery systems.

[0003] However, this results in a more complex and larger battery pack structure, leading to higher costs and reduced market competitiveness. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack that can easily achieve uniform heating of the battery system, and a battery pack containing the battery pack.

[0005] The battery pack of this utility model includes a battery bracket and multiple batteries housed in the battery bracket, wherein the multiple batteries are connected in parallel. Its characteristic is that...

[0006] It also includes two guide plates, which respectively cover the upper and lower surfaces of the battery holder.

[0007] The positive and negative terminals of the battery protrude from the retaining holes on the upper and lower surfaces of the battery holder, respectively, and are in close contact with the two guide plates.

[0008] The conductor plate that is in close contact with the positive terminal of the battery is the positive electrode conductor plate, and the conductor plate that is in close contact with the negative terminal of the battery is the negative electrode conductor plate.

[0009] The positive electrode plate and the negative electrode plate have both thermal and electrical conductivity functions.

[0010] Preferably, a PTC element is provided on the negative electrode plate at a position corresponding to the negative terminal face of the battery.

[0011] Preferably, the guide plate is a metal plate or an alloy plate.

[0012] Preferably, the guide plate is a composite plate containing an alloy layer or a metal layer, the alloy layer or metal layer being located on the inner side of the guide plate facing the battery.

[0013] Preferably, the positive electrode plate is a composite plate of aluminum plate and nickel sheet or a composite plate of copper plate and nickel sheet, and the negative electrode plate is an aluminum plate or a copper plate.

[0014] Preferably, the guide plate is fixed to the battery bracket by fixing screws.

[0015] The battery pack of this utility model is characterized in that it contains multiple battery packs as described above, wherein the multiple battery packs are connected in series, in parallel, or in a combination of series and parallel connections.

[0016] Preferably, the guide plate is a metal plate or an alloy plate, and in two adjacent battery packs, the positive electrode guide plate of one battery pack is closely connected to the negative electrode guide plate of the other battery pack.

[0017] Preferably, the battery brackets of the two adjacent battery packs are locked together by a long screw, so that the positive electrode plate of one battery pack is closely connected to the negative electrode plate of the other battery pack.

[0018] Preferably, a conductive connecting plate is further provided between the two adjacent battery packs.

[0019] Utility Model Effect

[0020] In this invention, the battery pack employs positive / negative electrode plates with both thermal and electrical conductivity on the end faces of each battery, reducing temperature differences between batteries through in-plane heat transfer. Furthermore, the battery pack uses long screws to lock the positive / negative electrode plates of adjacent battery packs together, achieving heat exchange between adjacent battery packs through inter-plane heat transfer. This ensures uniform heat distribution throughout the entire battery system, facilitating heat control by the battery management system (BMS). Attached Figure Description

[0021] Figure 1 This is a perspective view schematically showing the structure of the battery pack of this utility model.

[0022] Figure 2 This is an exploded view schematically showing the structure of the battery pack of this utility model.

[0023] Figure 3 This is a perspective view schematically showing the connection state of the two battery packs in the battery pack of this utility model.

[0024] Figure 4 This is a top view schematically showing the connection status of the ten battery packs in the battery pack of this utility model.

[0025] Figure 5 This is a perspective view schematically showing the appearance of the battery pack of this utility model. Detailed Implementation

[0026] The specific form of the battery pack and battery module of this utility model will be described below with reference to the accompanying drawings.

[0027] Figure 1 This is a perspective view schematically showing the structure of the battery pack of this utility model. Figure 2 This is an exploded view schematically showing the structure of the battery pack of this utility model.

[0028] like Figure 1 As shown, the battery pack (1) of this utility model includes: a battery bracket (2) and a plurality of batteries (3) housed therein, wherein the plurality of batteries (3) are connected in parallel. The invention is characterized by further including two guide plates (4a, 4b) that respectively cover the upper and lower surfaces of the battery bracket (represented as the left and right sides in the figure). This coverage can be approximately the entire surface; however, to control material costs, the guide plates may only cover the central area.

[0029] The positive and negative terminals of the battery (3) are exposed through the holding holes (5) on the upper and lower surfaces of the battery holder (2), respectively, and are in close contact with two guide plates (4). The guide plate in close contact with the positive terminal of the battery is the positive electrode guide plate (4a), and the guide plate in close contact with the negative terminal of the battery is the negative electrode guide plate (4b). The guide plates (4) have both thermal and electrical conductivity functions.

[0030] By setting a heat-conducting guide plate at the end face of the battery in the battery pack (1), it can serve as an internal heat dissipation mechanism. The heat generated in the battery pack (1) can be exchanged between multiple batteries through in-plane heat transfer, thereby reducing the temperature difference between batteries and effectively achieving uniform heat distribution in the battery system.

[0031] Furthermore, such as Figure 2 As shown, as an example, the assembly process of the battery pack of this utility model is as follows: First, multiple batteries (3) are placed in the lower frame (2a) of the battery holder (2) with their bottom surfaces facing down (in the figure, the positive terminal (3a) faces to the right). Then, the upper frame (2b) of the battery holder (2) is placed on the top surface of the battery (3) (in the figure, the negative terminal (3b)). The lower frame (2a) and the upper frame (2b) are closed by the locking mechanism (6) to position the battery (3). At this time, the positive terminal (3a) and negative terminal (3b) of the battery are exposed from the pre-set retaining holes (5) on the upper and lower surfaces of the battery holder (2), respectively. Then, a guide plate (4) is covered on the upper and lower surfaces of the battery holder (2), and the guide plates (4a, 4b) are fixed to the lower frame (2a) and the upper frame (2b) respectively by screws (8). Finally, the lower frame (2a) and the upper frame (2b) of the battery holder (2) are fixed together by fixing screws (9).

[0032] In this invention, the guide plate (4) has both thermal and electrical conductivity functions. Specifically, the guide plate (4) can be a metal plate or an alloy plate, or a composite plate containing an alloy layer or a metal layer. In the case where the composite plate contains a resin layer in addition to the alloy layer or metal layer, the alloy layer or metal layer is located on the inner side of the guide plate (i.e., the side facing the battery). Since the guide plate (4) has good thermal conductivity, the end faces of each battery (3) exposed from the holding holes of the battery holder can easily exchange heat between each battery (3) through in-plane heat transfer by close contact with the same guide plate (4), thereby achieving uniform heat distribution within the battery system (battery pack). Furthermore, the guide plate (4) also has a certain electrical conductivity function, which can conduct electricity between the electrode terminals of each battery. Therefore, the setting of relevant wires in the battery pack (1) can sometimes be omitted.

[0033] exist Figure 2 In the specific configuration shown, as a concrete example, the conductor plate in contact with the positive terminal of the battery is a positive electrode conductor plate (4a), which is a composite plate of aluminum plate and nickel sheet or a composite plate of copper plate and nickel sheet, and the conductor plate in contact with the negative terminal of the battery is a negative electrode conductor plate (4b), which is an aluminum plate or a copper plate, but is not limited to these. As long as it has good thermal and electrical conductivity, it can be made of any material. In this case, it is preferable to set the PTC element (7) at the position of the negative electrode conductor plate (4b) corresponding to the negative terminal of the battery (3b).

[0034] In the battery pack of this utility model, due to the use of an internal heat dissipation mechanism, namely parallel guide plates located on the end face of the battery for in-plane heat transfer, even if some batteries in the battery pack experience abnormal temperature rise or thermal runaway, the heat can be transferred to other parts of the battery pack in a timely manner, keeping the temperature of the overall battery system in a uniform state. Therefore, the heat dissipation efficiency of the battery pack can be greatly improved under the premise of a compact overall structure, ensuring the safety of the battery pack.

[0035] This utility model also provides a battery pack, characterized in that it contains multiple battery packs as described above, which can achieve uniform heat distribution in the battery system. The multiple battery packs are connected in series, in parallel, or in a combination of series and parallel connections, preferably in series.

[0036] In two adjacent battery packs, the positive electrode plate of one battery pack is in close contact with the negative electrode plate of the other battery pack. In this case, the electrode plate is preferably a metal plate or an alloy plate.

[0037] Figure 3 This is a perspective view schematically showing the connection state of the two battery packs (1, 1') in the battery pack of this utility model.

[0038] like Figure 3As shown, in two adjacent battery packs (1, 1') connected in series, the positive electrode plate (4a) of one battery pack (1) is closely connected to the negative electrode plate (4b') of the other battery pack (1').

[0039] Since both the positive electrode plate (4a) and the negative electrode plate (4b') have both thermal and electrical conductivity functions, and they are in surface contact with each other, heat exchange can be carried out not only between multiple batteries in the same battery pack through in-plane heat transfer of the plates, but also between two battery packs through inter-surface heat transfer of the two plates. This makes it more effective to achieve uniform heat distribution throughout the battery system and helps to extend the cycle life of the battery pack.

[0040] In addition, since the guide plate also has a conductive function, the close surface contact between the positive electrode guide plate (4a) and the negative electrode guide plate (4b') can also realize the electrical connection between adjacent battery packs, improve the reliability of series connection between battery packs, and reduce the internal resistance of the system.

[0041] Figure 4 This is a top view schematically showing the connection status of the ten battery packs in the battery pack of this utility model.

[0042] like Figure 4 As shown, 10 battery packs are connected in series in two rows of five. To prevent poor contact between the positive and negative electrode plates, it is preferable to fix the plates together from the top. Specifically, the battery brackets of two adjacent battery packs are locked together by a long screw (10), so that the positive electrode plate of one battery pack is in close contact with the negative electrode plate of the other battery pack, thereby realizing heat transfer between adjacent battery packs.

[0043] In addition, although the guide plate of this utility model also has the function of conducting electricity, in order to effectively prevent electrical failures caused by poor contact between the positive and negative guide plates, it is preferable to further provide a conductive connecting plate (11) between two adjacent battery packs.

[0044] Figure 5 This is a perspective view schematically showing the appearance of the battery pack of this utility model.

[0045] like Figure 5 As shown, the battery pack (12) of this utility model is a block formed by assembling the above-mentioned multiple battery packs in a housing. The multiple battery packs are connected to each other in series, but not limited to this. They can also be connected in parallel or in combination with series and parallel connections as needed. These battery packs share a battery management system (BMS).

[0046] This invention provides a battery pack that can achieve uniform heat distribution in the battery system. The battery pack internally transfers heat to each other through parallel guide plates on the battery end faces. This invention also provides a battery pack that can achieve uniform heat distribution in the battery system, wherein adjacent battery packs are connected to each other by guide plates, which can realize electrical connection between adjacent battery packs, reduce internal resistance of the system, and also realize heat transfer between adjacent battery packs, thereby making the heat distribution of each battery system in the entire battery pack balanced, which is beneficial to extending the cycle life of the battery pack.

[0047] The battery pack and battery module of this utility model have been described above with reference to the accompanying drawings and specific embodiments. However, this utility model is not limited to the specific embodiments described above. Various modifications or changes in elements can be made without departing from the spirit of this utility model, and these modifications or changes in elements are also included within the protection scope of this utility model.

Claims

1. A battery pack comprising a battery holder and a plurality of batteries housed in the battery holder, wherein the plurality of batteries are connected in parallel, characterized in that, It also includes two guide plates, which respectively cover the upper and lower surfaces of the battery holder. The positive and negative terminals of the battery protrude from the retaining holes on the upper and lower surfaces of the battery holder, respectively, and are in close contact with the two guide plates. The conductor plate that is in close contact with the positive terminal of the battery is the positive electrode conductor plate, and the conductor plate that is in close contact with the negative terminal of the battery is the negative electrode conductor plate. The positive electrode plate and the negative electrode plate have both thermal and electrical conductivity functions.

2. The battery pack according to claim 1, characterized in that, On the negative electrode plate, a PTC element is provided at a position corresponding to the negative terminal face of the battery.

3. The battery pack according to claim 1 or 2, characterized in that, The guide plate is a metal plate or an alloy plate.

4. The battery pack according to claim 1 or 2, characterized in that, The guide plate is a composite plate containing an alloy layer or a metal layer, and the alloy layer or metal layer is located on the inner side of the guide plate facing the battery.

5. The battery pack according to claim 1 or 2, characterized in that, The positive electrode plate is a composite plate of aluminum plate and nickel sheet or a composite plate of copper plate and nickel sheet, and the negative electrode plate is an aluminum plate or a copper plate.

6. The battery pack according to claim 1 or 2, characterized in that, The guide plate is fixed to the battery bracket by fixing screws.

7. A battery pack, characterized in that, The battery pack comprises any one of claims 1 to 6, wherein the plurality of battery packs are connected in series, in parallel, or in a combination of series and parallel.

8. The battery pack according to claim 7, characterized in that, The guide plate is a metal plate or an alloy plate. In two adjacent battery packs, the positive electrode guide plate of one battery pack is closely connected to the negative electrode guide plate of the other battery pack.

9. The battery pack according to claim 7 or 8, characterized in that, The battery brackets of the two adjacent battery packs are locked together by a long screw, so that the positive electrode plate of one battery pack is closely connected to the negative electrode plate of the other battery pack.

10. The battery pack according to claim 7 or 8, characterized in that, A conductive connecting plate is further provided between the two adjacent battery packs.

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